If hard glazed tile, and scraping with a plastic scraper ( even an old credit card), doesn’t get all of it you can look for a d-limonene based paint stripper. More aggressive is one based on NMP - n-Methylpyrrolidone.
you must wear the indicated chemical resistant gloves when working with either.
Many latex paints will soften with the use of heat, so you can try a hair dryer. Just don’t scorch the latex.